While we were with Messenger of Allah ﷺ who was distributing (i.e. some property), there came Dhu-l- Khuwaisira, a man from the tribe of Bani Tamim and said, "O Messenger of Allah ﷺ! Do Justice." The Prophet said, "Woe to you! Who could do justice if I did not? I would be a desperate loser if I did not do justice." ʿUmar said, "O Messenger of Allah ﷺ! Allow me to chop his head off." The Prophet ﷺ said, "Leave him, for he has companions who pray and fast in such a way that you will consider your fasting negligible in comparison to theirs. They recite Qur'an but it does not go beyond their throats (i.e. they do not act on it) and they will desert Islam as an arrow goes through a victim's body, so that the hunter, on looking at the arrow's blade, would see nothing on it; he would look at its Risaf and see nothing: he would look at its Na,di and see nothing, and he would look at its Qudhadh ( 1 ) and see nothing (neither meat nor blood), for the arrow has been too fast even for the blood and excretions to smear. The sign by which they will be recognized is that among them there will be a black man, one of whose arms will resemble a woman's breast or a lump of meat moving loosely. Those people will appear when there will be differences amongst the people." I testify that I heard this narration from Messenger of Allah ﷺ and I testify that ʿAli bin Abi Talib fought with such people, and I was in his company. He ordered that the man (described by the Prophet ﷺ ) should be looked for. The man was brought and I looked at him and noticed that he looked exactly as the Prophet ﷺ had described him. (Using translation from Bukhārī 3610)
بَيْنَا رَسُولُ اللهِ ﷺ يَقْسِمُ ذَاتَ يَوْمٍ قَسْمًا فَقَالَ ذُو الْخُوَيْصِرَةِ التَّمِيمِيُّ يَا رَسُولَ اللهِ اعْدِلْ قَالَ «وَيْحَكَ وَمَنْ يَعْدِلْ إِذَا لَمْ أَعْدِلْ؟» فَقَامَ عُمَرُ فَقَالَ يَا رَسُولَ اللهِ «ائْذَنْ لِي حَتَّى أَضْرِبَ عُنُقَهُ» فَقَالَ لَهُ رَسُولُ اللهِ ﷺ «لَا إِنَّ لَهُ أَصْحَابًا يَحْتَقِرُ أَحَدُكُمْ صَلَاتَهُ مَعَ صَلَاتِهِ وَصِيَامَهُ مَعَ صِيَامِهِ يَمْرُقُونَ مِنَ الدِّينِ مُرُوقَ السَّهْمِ مِنَ الرَّمِيَّةِ حَتَّى إِنَّ أَحَدَهُمْ لَيَنْظُرُ إِلَى نَصْلِهِ فَلَا يَجِدُ فِيهِ شَيْئًا ثُمَّ يَنْظُرُ إِلَى رِصَافِهِ فَلَا يَجِدُ فِيهِ شَيْئًا ثُمَّ يَنْظُرُ إِلَى نَضِيِّهِ فَلَا يَجِدُ فِيهِ شَيْئًا ثُمَّ يَنْظُرُ إِلَى قُذَذِهِ فَلَا يَجِدُ فِيهِ شَيْئًا سَبَقَ الْفَرْثَ وَالدَّمَ يَخْرُجُونَ عَلَى خَيْرِ فِرْقَةٍ مِنَ النَّاسِ آيَتُهُمْ رَجُلُ أَدْعَجُ إِحْدَى يَدَيْهِ مِثْلُ ثَدْيِ الْمَرْأَةِ أَوْ كَالْبَضْعَةِ تَدَرْدَرُ» قَالَ أَبُو سَعِيدٍ «أَشْهَدُ لَسَمِعْتُ هَذَا مِنْ رَسُولِ اللهِ ﷺ وَأَشْهَدُ أَنِّي كُنْتُ مَعَ عَلِيِّ بْنِ أَبِي طَالِبٍ حِينَ قَاتَلَهُمْ فَأَرْسَلَ إِلَى الْقَتْلَى فَأُتِيَ بِهِ عَلَى النَّعْتِ الَّذِي نَعَتَ رَسُولُ اللهِ ﷺ»